This report evaluates the use of electrical method and borehole data to investigate the subsurface to delineate the groundwater potential in Enugu metropolis and the environs, south-eastern Nigeria other than rely onl...This report evaluates the use of electrical method and borehole data to investigate the subsurface to delineate the groundwater potential in Enugu metropolis and the environs, south-eastern Nigeria other than rely only on resistivity method w</span><span style="font-family:Verdana;">hich could lead to interpretation error. Integrating these 2 data sets is key in this study. The study area is located in the Anambra Basin and is underlain by Nkporo/Enugu Shale which is overlain by the Mamu Formation. It is bounded by Latitudes 6</span><span style="font-family:Verdana;"><span style="white-space:nowrap;">°</span>2 0'00</span></span><span style="font-family:Verdana;">"</span><span style="font-family:Verdana;">N to 6<span style="white-space:nowrap;">°</span>30'00</span><span style="font-family:Verdana;">"</span><span style="font-family:Verdana;">N and Longitudes 7<span style="white-space:nowrap;">°</span>25'00</span><span style="font-family:Verdana;">"</span><span style="font-family:Verdana;">E to 7<span style="white-space:nowrap;">°</span>35'00</span><span style="font-family:Verdana;">"</span><span style="font-family:""><span style="font-family:Verdana;">E and covers surface area of about 342 m</span><sup><span style="font-family:Verdana;">2</span></sup><span style="font-family:Verdana;">. Thirty</span></span><span style="font-family:Verdana;">-</span><span style="font-family:Verdana;">one vertical electrical soundings (VES) were carried out across the area using the Schlumberger electrode array with current electrode separation from 2 to 500 m to identify the depths and resistivity values of the identified geo-electric layers. Through data analysis using WinResist software, the apparent resistivity, thicknesses and depths and the thicknesses of the aquifers were generated. The resistivity</span><span style="font-family:""> </span><span style="font-family:Verdana;">and depths were modelled to generate resistivity map and depth map. The resistivity of the aquiferous zone within the study area varie</span><span style="font-family:Verdana;">d</span><span style="font-family:Verdana;"> from 20.55</span><span style="font-family:""> - </span><span style="font-family:Verdana;">427.8 ohm-m at depths of between 10.7</span> - <span style="font-family:Verdana;">40.05 m. Depth to the water table appears to be shallow at the south western part of the map. The interpreted geo-electric layers show a sequence of lateritic top soil, shale, sand and shale. The frequency distribution of the VES curves generated shows the presence of 3 to 5 layers with HK type as the highest. Also, a 2D model was generated using the correlation of VES to VES data and borehole data to VES data to show the underlying stratigraphy beneath the study area as well as the direction of ground water flow. Result of the VES curve analysis reveal</span><span style="font-family:Verdana;">s</span><span style="font-family:Verdana;"> that the sub-surface is underlain by three lithological layers namely: lateritic top soil, shale, sand and shales with NW direction of groundwater flow from the 2D model. Groundwater prospective zones can be seen along NW, SW and central parts of the study area which have low resistivity values.展开更多
文摘This report evaluates the use of electrical method and borehole data to investigate the subsurface to delineate the groundwater potential in Enugu metropolis and the environs, south-eastern Nigeria other than rely only on resistivity method w</span><span style="font-family:Verdana;">hich could lead to interpretation error. Integrating these 2 data sets is key in this study. The study area is located in the Anambra Basin and is underlain by Nkporo/Enugu Shale which is overlain by the Mamu Formation. It is bounded by Latitudes 6</span><span style="font-family:Verdana;"><span style="white-space:nowrap;">°</span>2 0'00</span></span><span style="font-family:Verdana;">"</span><span style="font-family:Verdana;">N to 6<span style="white-space:nowrap;">°</span>30'00</span><span style="font-family:Verdana;">"</span><span style="font-family:Verdana;">N and Longitudes 7<span style="white-space:nowrap;">°</span>25'00</span><span style="font-family:Verdana;">"</span><span style="font-family:Verdana;">E to 7<span style="white-space:nowrap;">°</span>35'00</span><span style="font-family:Verdana;">"</span><span style="font-family:""><span style="font-family:Verdana;">E and covers surface area of about 342 m</span><sup><span style="font-family:Verdana;">2</span></sup><span style="font-family:Verdana;">. Thirty</span></span><span style="font-family:Verdana;">-</span><span style="font-family:Verdana;">one vertical electrical soundings (VES) were carried out across the area using the Schlumberger electrode array with current electrode separation from 2 to 500 m to identify the depths and resistivity values of the identified geo-electric layers. Through data analysis using WinResist software, the apparent resistivity, thicknesses and depths and the thicknesses of the aquifers were generated. The resistivity</span><span style="font-family:""> </span><span style="font-family:Verdana;">and depths were modelled to generate resistivity map and depth map. The resistivity of the aquiferous zone within the study area varie</span><span style="font-family:Verdana;">d</span><span style="font-family:Verdana;"> from 20.55</span><span style="font-family:""> - </span><span style="font-family:Verdana;">427.8 ohm-m at depths of between 10.7</span> - <span style="font-family:Verdana;">40.05 m. Depth to the water table appears to be shallow at the south western part of the map. The interpreted geo-electric layers show a sequence of lateritic top soil, shale, sand and shale. The frequency distribution of the VES curves generated shows the presence of 3 to 5 layers with HK type as the highest. Also, a 2D model was generated using the correlation of VES to VES data and borehole data to VES data to show the underlying stratigraphy beneath the study area as well as the direction of ground water flow. Result of the VES curve analysis reveal</span><span style="font-family:Verdana;">s</span><span style="font-family:Verdana;"> that the sub-surface is underlain by three lithological layers namely: lateritic top soil, shale, sand and shales with NW direction of groundwater flow from the 2D model. Groundwater prospective zones can be seen along NW, SW and central parts of the study area which have low resistivity values.
